I'm
trying to catch the iguana in a towel so I can retrieve it from
the swimming pool. The iguana is (from its own perspective)
trying to evade a predator intent upon eating it. At this point
in the chase it's difficult to predict which direction the iguana
is going to go. So, there is no point in making a dive for it and
hoping to catch a moving target, as all that will make is a big
splash.

So
it's just a matter of waiting to see what direction the iguana
will choose to take.